Cyclone Fani is beginning to make landfall in eastern India.
The country's Meteorological Department says wind speeds will reach 195 km/h (121 mph) when the storm is at full force.
More than a million people in the state of Orissa have already been forced to leave their homes.
Several neighbouring states in India have also been put on high alert.

Kushner's talks with Israel, Hamas end without breakthrough on Gaza plan
Trump orders Pentagon to cut back military exercises with South Korea
India's BJP replaces social media head weeks after youth protests
6 die at temple in India's Bihar after 'stampede-like' event, officials say
Trump's envoys meet mediators, Israel strikes Gaza